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Finding the Fourth Proportional to 20,642.76, 28,487 and 11,211.52

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Solution

The fourth proportional to 20,642.76, 28,487 and 11,211.52 is: 15,471.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,642.76 : 28,487 = 11,211.52 : x
  2. Step 2: Convert to fraction form
    20,642.76/28,487 = 11,211.52/x
  3. Step 3: Cross multiply
    20,642.76x = 28,487 × 11,211.52
  4. Step 4: Simplify right side
    20,642.76x = 319,382,570.24
  5. Step 5: Solve for x
    x = 319,382,570.24/20,642.76
  6. Step 6: Final answer
    x = 15,471.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.